Results 41 to 50 of about 464,477 (298)

Kresling Origami‐Based Metamaterial Robot for Dynamic Electromagnetic Control

Advanced Science, EarlyView.
A reconfigurable metamaterial system integrates deformable origami units with high‐permittivity ceramic plates. Pneumatic switching between structural states alters local resonance conditions, enabling dynamic radar stealth and adaptive microwave reflection for mobile communication.
Xinxi Zeng, Long Zhou, Shaojie Xi, Yixuan Gao, Desheng Pan, Chaoyang Sun, Haoxin Sun, Xian Wang, Lingyun Qian, Peipei Li, Pengfei Zhu, Bo Li, Jiang Luo, Ji Zhou   +13 more
wiley   +1 more source

Geodesic H-Plane Horn Antennas

IEEE Transactions on Antennas and Propagation, 2023
This article describes a detailed procedure that allows for a time-efficient design of fully metallic geodesic H -plane horn antennas using an in-house ray-tracing method together with an optimization algorithm. With all the propagation in the air, geodesic H -plane horn antennas are low-loss and highly efficient.
Mingzheng Chen, Francisco Mesa, Oscar Quevedo-Teruel   +2 more
openaire   +3 more sources

Space‐Time Metasurface Antenna Enabled High‐Dimensional Electromagnetic Modulation for Intrinsic Physical Layer Security

Advanced Science, EarlyView.
The concept of high‐dimensional EM modulation using the STMA for physical layer secure communication is illustrated in figure. The STMA consists of a series of programmable unit cells, with 1‐bit reconfigurable phase states (0/π). The STMA is excited by a monochromatic continuous wave (CW) at frequency fc and controlled by a field‐programmable gate ...
Xinyu Fang, Yiqing Sun, Chenfeng Yang, Siran Wang, Zheng Xing Wang, Kaixu Wang, Geng‐Bo Wu   +6 more
wiley   +1 more source

Measurement-Based Characterization of 15 GHz Propagation Channels in a Laboratory Environment

IEEE Access, 2017
In this paper, measurements in a laboratory characterizing the 15-GHz band propagation channels are introduced. Both an omnidirectional antenna (ODA) and a 10° half-power-beamwidth (HPBW) pyramidal horn antenna are deployed at the transmitter (Tx)
Xuefeng Yin, Yilin Ji, Hua Yan
doaj   +1 more source

Scattering characteristics of antennas in cyberspace

工程科学学报, 2020
5G network technology can meet the high requirements of cyberspace development in the performance of communication platforms. Massive MIMO (multiple-input multiple-output) antenna array is one of the core technologies of 5G. The mutual coupling effect of
Jian-zhong CHAI, Hang-yu CHEN, Hao-hui HONG, Xu CHAO, Jing-cheng ZHAO   +4 more
doaj   +1 more source

Hierarchical Physical‐Cyber Encryption via Metasurface‐Encoded Holographic Keys

Advanced Science, EarlyView.
ABSTRACT Physical‐layer encryption based on metasurfaces has emerged as a promising alternative to conventional algorithmic cryptography by embedding security into physical processes. However, most existing metasurface‐based encryption schemes operate within single‐stage or static frameworks, where correct physical illumination directly reveals the ...
Zhen Liu, Changhong Dai, Wei Zhu, Ruisheng Yang, Bohan Zhang, Lei Zhang, Bobo Du, Shengxiang Wang, Guangwei Hu   +8 more
wiley   +1 more source

Substrate Engineering of SWCNT p–n Junctions for Dual‐Mode Power Generation and Heat‐Flux Sensing

Advanced Science, EarlyView.
Through substrate engineering alone, a single‐walled carbon nanotube p–n junction device switches between two functions under uniform infrared irradiation. A low‐absorbance substrate sustains a central hot junction for continuous power generation, whereas high‐absorbance substrates transiently invert the temperature gradient for sensitive heat‐flux ...
Ryota Tamai, Hiroto Nakayama, Shuya Ochiai, Masayuki Takashiri   +3 more
wiley   +1 more source

Endothelial YAP Signaling Promotes Blood‐Spinal Cord Barrier Repair in Mice After Spinal Cord Injury

Advanced Science, EarlyView.
Endothelial YAP is required for blood‐spinal cord barrier repair after spinal cord injury. YAP‐dependent vascular repair is associated with ANGPT1/PI3K/AKT signaling in vivo and may involve endothelial‐pericyte paracrine interactions. By supporting vascular remodeling, tight junction restoration, restored pericyte coverage, and astrocyte‐vascular ...
Jiawei Wang, Yaozhi He, Yanjiao Wang, Jingjing Zhang, Qishun Liang, Mengxian Jia, Yumin Wu, Zongjie Yuan, Ziwei Fan, Yuxuan Li, Huihui Zhang, Qinjiao Fu, Ying Wang, Zhihui Huang, Honglin Teng   +14 more
wiley   +1 more source

Robust Design of 3D-Printed 6–18 GHz Double-Ridged TEM Horn Antenna

Applied Sciences, 2018
A robust design of a 3D-printed 6–18 GHz double-ridged TEM horn antenna is proposed in this paper. The designed TEM horn antenna has two parts: an adaptor and a horn aperture.
Sungwoo Lee, Youngoo Yang, Kang-Yoon Lee, Kyung-Young Jung, Keum Cheol Hwang   +4 more
doaj   +1 more source

Sub-THz Circularly Polarized Horn Antenna Using Wire Electrical Discharge Machining for 6G Wireless Communications

IEEE Access, 2020
A novel compact high-efficient circularly polarized conical horn antenna is realized with Wire Electrical Discharge Machining (EDM) technique operating at 300 GHz for 6G wireless communications is presented.
Basem Aqlan, Mohamed Himdi, Laurent Le Coq, Hamsakutty Vettikalladi   +3 more
doaj   +1 more source